Eyeglass frame having tension adjustable temple coupling

Abstract

The structure of changeable spring of industrial glasses comprises a plastic glasses frame; a hinge means comprising a first hinge member and a second hinge member, the first hinge member fixed on one the of the glasses frame and pivotally connected with one side of the second hinge member by a screw, the other side of the second hinge member being form a hole of the screw thread; a spring; a rivet pin connected to the hole of the second hinge member and fixed by screw thread; two glasses temples formed a tunnel in the top, located the spring and the rivet pin, and the side of the glasses temple top located a pit; and a assembly element which the part of it put into the tunnel of the glasses temple and located a recess, the dimension the same as the rivet pin, connected with the spring and the rivet pin and the portion of it as a cap filled with the pit of the glasses temple.

What claimed is claimed:  
     
       1. An eyeglass frame comprising: 
       (a) a lens frame member;  
       (b) a plurality of temple members, each said temple having a front end portion defining a tunnel cavity extending longitudinally therein, said front end portion having formed therein a pit opening communicating with said tunnel cavity; and,  
       (c) a coupling assembly coupled to each of said temple members for hingedly coupling said temple member to said lens frame member in tension adjustable manner, said coupling assembly including:  
       at least one hinge member disposed in pivotally displaceable manner relative to said lens frame member, said hinge member engaging said tunnel cavity of one said temple member;  
       an assembly element coupled to said hinge and temple members for locking the engagement thereof, said assembly element extending transversely into said tunnel cavity through said pit opening of said temple member, said assembly element being disposed selectively in at least first and second alternative positions; and,  
       a spring element disposed within said tunnel cavity of said temple member, said spring element engaging said assembly element for resiliently biasing the coupling of said hinge and temple members, said spring element generating different degrees of bias responsive to said assembly element being in said first and said second positions.  
     
     
       2. The eyeglass frame as recited in  claim 1  wherein said hinge member includes a pin portion extending longitudinally therefrom, said spring element being captured in biased manner against said assembly element by said pin portion. 
     
     
       3. The eyeglass frame as recited in  claim 2  wherein said pin portion is coupled in adjustably displaceable manner to a body portion of said hinge member, said pin portion being displaceable relative to said body portion for adjusting the bias of said spring element. 
     
     
       4. The eyeglass frame as recited in  claim 3  wherein said pin portion is threadedly coupled to said body portion of said hinge member. 
     
     
       5. The eyeglass frame as recited in  claim 1  wherein said assembly element is accessible for manipulation through said pit opening. 
     
     
       6. The eyeglass frame as recited in  claim 1  wherein said first position of said assembly element is inversely related to said second position thereof.